Here is my two cents on your thread and then I'm done.
I see nothing wrong with what you're doing, I think you're off to a great start.
Dry rock is a great start, some folks have trouble with it if they've never owned a reef tank before, but I saw you were cycling it, great start! It's important to let it build that bio film, it will help resist algae.
HOB filters are a joke for a reef tank, a sump with a beananimal overflow and a pump to turn over 3-5 (debatable topic) times your water volume per hour is the way to go!
Get yourself some used 10 gallon tanks if you have room for them in the garage or basement (I found mine at the thrift store) and use one for quarantining fish and one for quarantining corals. They need to be filtered separately from each other in case of the need to dose ich treatments (copper), or bacterial infection treatments. The fish quarantine can have a sponge filter and air stone as long as you do consistent water changes during the quarantine period. When you're not quarantining, just store the tanks on a shelf or something.
Buy a good RO/DI system, Bulk Reef Supply has great ones and good deals.
Get some Rubbermaid brute trash cans (if you have room) to store freshwater and mix saltwater, the saltwater needs a heater and cheap power head to help you mix the saltwater.
Dip your corals
If you do find bristle worms in the display tank, don't kill them, get some tweezers and throw them in the sump they do support the cleaning crew.
Unions, unions, unions
Lights are fiercely debated so I won't go into specifics but buy good lights, ATI, AI, radieons, etc. LEDs, and T5s are my poison of choice.
Use good reliable test kits, Hanna checker for alkalinity (it's quick and painless)
Buy a good skimmer
Buy good power heads (tunze, or ecotech)
Auto Top Off is a life saver
An aquarium controller is a great asset but not entirely necessary if you've made good choices with your other equipment. A controller will help you sleep better.
Cobalt neo-therms, eheim jagers, and finnex are good heater choices.
And a reef safe check valve for your pump return line will add some piece of mind.
I'm done, I think